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Social Studies, 27.03.2020 23:31 HannahVance99

Imagine an advanced civilization living on a planet orbiting at a distance of 10 AU (1.5 billion kilometers) from a close binary star system that consists of a 15 MSunred giant star and a 10 MSunblack hole. The black hole is surrounded by an accretion disk. Sometime within the next million years or so, the civilization's planet is likely to be doomed because .

a. the planet's orbit gradually will decay, as it is sucked in by the black hole.

b. the red giant star, which provides most of energy the civilization needs to exist, will soon be destroyed in the accretion disk.

c. tidal forces from the black hole will rip the planet apart.

d. the red giant will probably supernova within the next million years.

e. jets of material shot out of the accretion disk will shoot down their planet.

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